Goodwill and Other Intangible Assets - Goodwill (Details) $ in Millions	6 Months Ended
	Jun. 30, 2023 USD ($)
Goodwill [Roll Forward]
Goodwill, Beginning Balance	$ 723.8
Adjustments	(0.9)
Goodwill, Ending Balance	722.9
All Other
Goodwill [Roll Forward]
Goodwill, Beginning Balance	1.0
Adjustments	(1.0)
Goodwill, Ending Balance	0.0
Live and Historical | Operating Segments
Goodwill [Roll Forward]
Goodwill, Beginning Balance	280.3
Adjustments	0.1
Goodwill, Ending Balance	280.4
TwinSpires | Operating Segments
Goodwill [Roll Forward]
Goodwill, Beginning Balance	152.2
Adjustments	0.0
Goodwill, Ending Balance	152.2
Gaming | Operating Segments
Goodwill [Roll Forward]
Goodwill, Beginning Balance	290.3
Adjustments	0.0
Goodwill, Ending Balance	$ 290.3